Carbureter.



A. DUGREY.

CARBURETER. APPucATloNHLED 4113,1314` 1 ,1 86,976 Patented J uney 13, 1916.

121111 WITNESSES A /N VEN TOR serra: sfrar ,fp essere@ Aor:e'ii-ca.,.

ARTHUR DUGREY, OF DETROIT, MICHIGAN, SSIGNOBTO HQLLEY BROTHERS COIdl-f PNY, OFDETBOIT, MCHlGAN, A CORPORATION OFICHIGLN. 1

canzoncina.

To all whom 'it inag/ concern: L

Be it known that I, ARTHUR DUG EYT a citizen of the United States of America, residing at Detroit, in the county of 'Wayne and State of. Michigan, have invented certain new and useful Improvements in Carbureteis, of which the following is a specification, reference being had therein to the accompanying drawings.`

The invention relates to carbureters of .thattype in whichv a separate passage is provided for the commingled air and fuel when the engine is idling7 from the main passage used when the engine is working under load.

It is the object of the present invention to obtain a construction which will voperate more satisfactorily under variable conditions'and in which adjustment iseliected by the setting of a singleyalve.

It is a further object p utilize a difierential pressure drop for#dischargingthe liquid fuel into the main and'auxi'liary mixing passages. I i

'In the drawings: Figure 1" is a longitiidinal central section through the carbui'eterf; and Fig. 2 is adiagram showing a modified construction andalso the dileren'tial pressure drop in dilerent portions of the mix-` ing chamberand under varying velocities;

A is the carbiiijeter. casing which -is provided with an annular-float chaniber'B containing tlie float C and a central discharge nozzle D controlled by the needle valve E.

F is an'air inlet passage to the casing and G is the main mixing chamber ar-4 ranged within the inlet chamber F and con centric with the discharge nozzle D. s

H is 'a throttle valve and I'is the ali'xiliary passage for the fuel vabove the throttle H when the engine is running idl- To 'secure a more thorough commingling of the fuel' and air andl also effect ad1ustment by a'single valve, the discharge noz-V zle for the fuel is of the following construction: I is the restricted passage whieh`is directly controlled by vthe needle valve E and which terminates at a point below the normal level J of the liquid Within the float chamber. K is a cup at the-upper end of the passage I which rises to a point above the level J. L is an extensionof the nozzle which is .arranged within the cup K, its Lower end being supported from the bottom ifsaid cup and its .upper end rising to a.

Specification of Letters Patent. A Patented June 13, 19416. Application led March 3, 1814. Serial No.822,120.

F ig. l, the tube L is forined inY two sectionsV L `and L2, the forner being a'.restricted nozzle secured in the spider M extending across the cup K. The section L2 -is of point above thelevel J and-within the mixl ing chamber G. 'As specifically shown in' larger diameter and is -provided Withase- 5 ries of small open'ngs .L3 lit its, loweii" end which are arrange slightly' below the Aupper end of the nozzle L and alsolbelow tlie" vtop ofthe cup K. The tube I which forms the auxiliary passagefor t e uelto the point above-the throttle H ha its lower end `extended downward into the cup K, ilvhere it is sealed by the liquid therein when ai@ thelll7 normal level Thus in initial operation, where theY throttle H.is closed, the suction produced by'jcranking the enginewill cause the lifting'of the liquid fuel in -the cup-K through the tube I and the discharge of the chamber G will Yproduce a pressure therebyr at the upper end of the nozzle section L, whichwill discharge the liquid from the i cupiK through said nozzle into the main air current.

Thisaction will unseal the lower end of the tube l, preventing further passage 'of the liquid thereinto, and will also permit the air from the..inlet F to pass downward in thecup and into the l'owcr end Aof the nozzle L. where it is commingled with through the passage I. i l With the construction as above described, whenever it is necessary to adjust the carthe stream of liquid discharged bureter., the opening or closing of the valve E will e`ct this adjustment which -will control botli the main and the auxiliary commingling devices. Furthermore, when the,

'carburetor is operating under variable velocities of air current th'erewill be 'an increase andi decrease of pressure drop at both thedischargeend of the-nozzle Land also at the`discharge end of the passage but the ratio of variation is not the saine. This is indicated in the diagram. Fig. 2, in which the curves O O. etc., indicate the. relative variation in pressure drop at different points in.the mixing chamber, which is in projection therewit 75 f same into the passage above the throttle H,J

The purpose of forming the tube L2 of greater diaii'ietcr than thc nozzle L and of also providing the inlet apertures L, is to accelerate the action. Thus, were the nozzle L to extend without interruption from the cup to the point where it terminates in the mixing cliaii'iber, an appreciable time interval would be required in elevating the liquid fuel through thisnozz'le before it would be mixed with the air. On the other-hand, with the construction as shown, the pressure-drop at the upper end ot thel section L2 will be transferred therethrough to a point immediately above the nozzle section L', which will quickly lift the oil therein, while the .air entering through the ports L3 willbe 'commingled with the oil. A.

It will be noted that the form of tlie passage within the carbureter casing is that of A-a- Venturi tube, .bach upon itself.

lV hat I- claim as my invention is;-

1. In a earbureter` the combination with'a casing having a Venturi tube l'providing a.- comniingling passage, of, anf interrupted open ended nozzle for the discharge of the liquid fuel into said passage having re- 'stricted communication at fa plurality' of separate points along the longitudinal axis thereof witlrsaid- Venturi tube only.

2, In a carhureter, the combination with a easing having a Venturi tube providing` a commingling passage, of an interrupted nozzlev for discharging the liquid fue] into said pa'seage. having its outer end unrestricted and located above tlie'normal level of the liquid, and the interruptions located below said level at, different depths and adapted to restrictedly communicate only with said Venturi tube. Y

3.71m' a carlilureter, the coml'iination with a casingliavin'g a Venturi tube providing a commingling passage, of an interrupted nozzle' for discharging liquid fuel into said passage` the upper end of said nozzle being unrestricted and located above the normal. level of the liquid and at a point ofgreater ressure drop,.and tne interruption being elow' said level and adapted to restrictedly communicate with said Venturi tube only at separate points of le'e pressure drop, and acup `su`rrounding`the interiilptioiiin lsaid nozzle and rising to normal level of the liquid.

4. ln a carbureter, the combination with this tube being doubled a easing liavinga Venturi tube providing :r eonimingling passage, of a throttle valve for said passage. aninterrupted nozzle for discharging liquid into said passage below said throttlevalve, the upper end of said. nozzle being open and above the normal level of the liquid and the interruption. be-

strictediy communicate with 'to resaid Venturi tube. only, a c p lsi!rrounding said' interruption and rising to the 'hydrost t'c level, and au auxiiiarv discharge conduit having its lower end extending into said cup be i. :said level and its upper end discharging above said throttle valve.

5. ln a carburetor, the combination with a easing havingr a comminwling paseage adapted to produce a variable pressure drop in different portions thereof, of a nozzle for discharging the liquid fuel into said passage comprising a` restricted member arranged at ingnelow said level and adapte,

a point where there is less than vthe maximum pressure drop, said restricted member having restricted communication withsaid passage only, and an open ended tubular member extending from a point of greater preseure drop into proximity to the discharge end of said restricted member, Said tubular member transferring substantiall)1 said greater preasure drop.

(j. In a carburetor` the combination with the casing having aVenturi tube providing a commingling passage, of a nozzle for disi charging the liquid fuel, comprising a restricted portion and an unrestricted portion of greater diameter'than said restricted p0rtion extending fromapoint in said cour mingling chamber having a greater pres-- siii'e. li'op to the upper end of said restricted portion and provided with laterally restricted zur inlet portions-adjacent to said restricted portion adapt-ed to communicate.

with` said Venturi tube only.

7. In a earbureter, the combination with a casing having-a coinmingling passage, of a nozzle for discharging the liquid fue] into said paeage, and means for substantially transferring the pressure drop occurring at a higher point in said eoinmingling pasige to a point adjacent to the lower end of said nozzle, said transfer being substantially iiidependent of' the flow through said passage. 8. In a carburetor, the 'combination of a casing having a Venturi tube, providing a coinn'iingling paseage, of an interrupted noz- '/.le having a restricted lnozzle and a nozzle tube of larger diameter than said restricted nozzle, said nozzle tube having an unrestricted upper end terminating at a point of greaterpressure drop w'itliin said Venturi tube, and a lower end adapted to` communirate. with a oint of a'lower pressure drop within said Venturi tube only. i

ln testimony whereof l allix my signature in presence of two'witiics'ses.

ARTHUR DUGREY.' Witnesses:

JAMES l. Banni', PiivLLis CouUuN. 

